In Syria, government and rebel forces continue to clash in the northern city of Aleppo. The rebels -- including the Nur Al Din Zinki group -- are among those fighting against President Bashar al-Assad's forces.

Video footage captured by Reuters shows government forces battling to retake positions lost to the rebels. Aleppo has become the focal point of fighting in Syria's war -- now in its sixth year -- which pits Assad and his allies against Sunni rebel groups including some supported by Turkey, Gulf Arab monarchies and the United States.